ocr: NUCLEAR POWER - - STEEL NEUTRON C& SHIELD CONTROL RODS Immense heat COOLANT HOT 1S generated IN COOLANT by the fission OUT ofthe uranium fuel in the core ofa nuclear reactor. PUEL RODS A - gas or liquid coolant carries the heat away from the core to a - steam generator. The main type of reactor used in nuclear power stations is the pressurized- water reactor (PWR). This uses water as the coolant. Nuclear Fission